Live crown ratio is defined as the ratio of crown length to total tree height.

Live crown ratio is defined as the ratio of crown length to total tree height.

• A. Crown length divided by total tree height
• B. Crown width divided by trunk diameter
• C. Trunk diameter divided by tree height
• D. Crown length divided by crown width

Answer: (A)

Live crown ratio tells us how much of a tree’s height is made up by the living, green crown. It is defined as crown length divided by total tree height. Crown length is the vertical distance from the base of the live crown to the tip of the crown, so this ratio compares how tall the crown is relative to the entire tree. The value is dimensionless and often expressed as a percentage, for example, a crown length of 12 feet on a 30-foot tree gives 12/30 = 0.4, or 40%. This focuses on the vertical extent of the crown, not its width or the trunk diameter, which is why the other options don’t describe the live crown ratio.

Live crown ratio tells us how much of a tree’s height is made up by the living, green crown. It is defined as crown length divided by total tree height. Crown length is the vertical distance from the base of the live crown to the tip of the crown, so this ratio compares how tall the crown is relative to the entire tree. The value is dimensionless and often expressed as a percentage, for example, a crown length of 12 feet on a 30-foot tree gives 12/30 = 0.4, or 40%. This focuses on the vertical extent of the crown, not its width or the trunk diameter, which is why the other options don’t describe the live crown ratio.